Expansion-reamer



S. H. HUMPHREY AND F.-H. KORFF.

EXPANSION REAMER. APPLICATION FILED MAY 29. ms.

Patented Aug. 17, 1920.

WITNESSES UNITED STATES PATENT OFFICE.

STARLING n. HUMPI-IREY, or NEW YORK, AND FREDERICK H. KORFF, F BROOKLYN NEW YORK.

EXPANSION-REAMER.

Specification of Letters Patent.

Patented Aug. 17, 1920.

T 0 all whom 2'25 may concern:

Be it known that we, STARLING H. IIUM- runny, a citizen of the United States, and a resident of the city of New York, Beechhurst, borough of Queens, in the county of Queens and State of New York, and FRED- ERICK H. Konrr, a citizen of the United States, and a resident of the city of New York, borough of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Expansionlieamer, of which the following is a full, clear, and exact description.

This invention relates to an expansion reamer and more specifically to an improved means for permitting the convenient and ready adjustment of the blades thereof.

One of the objects of this invention is to provide an adjusting means which is inexpensive to manufacture simple and rugged in construction and is so constructed and arranged as to be readil adjusted to obtain a definite adjustment 0 the cutting edges of a tool.

While it is not broadly new to provide a means for obtaining radial adjustment of the cutting blades of a tool, the constructions heretofore suggested are complicated in construction and are expensive to manufacture necessitating finely finished and ground surfaces and do not make proper provision to compensate for surfaces subject to wear.

A further object of this invention is to overcome the difiiculties heretofore encountered and to provide a micrometer adjusting means so constructed as to require a minimum of finished surfaces and so constructed and arranged as'to insure a uniform moveembodiment of our invention and in which,

Figure 1 is a side view of a reamer constructed in accordance with our invention, and showing parts 1n assembled condltion.

Fig. 2 is a sectional view taken along the lines 2-2 of Fig. 1. a

Fig. 3 is a plan view of Fig. 1 with one of the retaining elements removed.

Fig. 4 is a sectional View taken along the lines 4-4 of Fig. 2,

Fig. 2]. partly sectional view disclosing our lnventlonapplied to a slightly different form of reamer as that disclosed in the foregoing figures.

Fig. (5 is a sectional view taken on the line -6 of Fig. 5.

Fig. 7 illustrates a detail of construction employed in connection with our invention.

In all of these views like reference numerals designate similar parts, and the reference numeral 1 indicates a spindle which is formed in its face, and adjacent one of its ends with longitudinally extending radial slots 2 of decreasing depth. In this connection it is to be noted that the slides are arranged to one side of the axis of rotation of the body of the reamer so that similar sides 3 and 3' of oppositely disposed slots will be in alinement for a purpose hereinafter more fully specified.

Adjacent its end the spindle 1 is provided with a reduced portion forming a threaded stud 5 upon which is mounted a nut 6 formed with a recess in one of its faces. Cutting blades 8 are mounted Within the slots 2 and have their bodies tapered throughout their entire length as has been clearly indicated by the reference numeral 9 in Pig. 2 so that upon such blades being moved longitudinally through the slots 2 the decreasing depth of the latter will co-act with the tapered body portion of the former and result in a radial movement on the part of the blades 6. Thus the diameter of the reamer will be varied by moving the blades longitudinally in the slots 2 in that u on the blades being moved toward the end 0 the spindle the dlameter will be increased, and upon a movement in the oposite direction, the same will be decreased.

he outer ends of the blades 8 are'beveled or otherwise suitably formed to provide a firm inter-engagement between the recessed portion 7 of the nut 6 and such blades, the nut thus functioning to retain one end of the blades in applied position.

The face of the spindle 1 is formed with screw threads 12 at a point in advance of and beyond the lowerend of the slots 2 and in the portions between the slots. Mounted upon these screw threads and engaging the lower ends of the blades 8 in a manner similar to the engagement existin between the nut 6 and the upper ends of t e blades, is a second nut 11, this latter member being also formed with a recess in one of its faces adapted to co-act with the beveled lower ends 13 of the blades 8.

As has been clearly illustrated in Fig. 1, the member 11 has associated with its outer face graduations 15 which are brought, upon said member being rotated, into alinement with a marker or indicating line 16 above the outer face of a collar 17 movable longitudinally of the spindle 1, it being noted that the collar 17 is restrained from rotation as has been shown in Fig. 7 by an inwardly projectingtongue 18 extending into a slot 19 formed in the face of the spindle 1 and which slot 19 may conveniently form a continuation of one of the slots 2.

A second nut 20 is conveniently mounted upon the screw threads 12 and serves as a locking member for the collar 17 and member 11, the outer surface of the member 11 \nd nut 20 being preferably formed with a Knurled surface, to facilitate a grasping1 and turning thereof. It is also to be note that the rear end of the spindle 1, which in operation is inserted in a suitable positioning tool or chuck (not shown) is preferably of smaller diameter than the outer end thereof to permit the removal of the collar 17 and graduated member 15.

'Now referring to the construction illustrated in Fig. 5 it will be seen that we provide, similar to the micrometer adjustment in the foregoing figures, a nut 20, collar 17 and graduated member 15. This view merely illustrates the adaptability of our micrometer adjustment to any type of reamer in that we provide in the construction illustrated in this view a tapered core 21 which co-acts with the blades 8 to project them radially such core being formed with a reduced screw threaded end 22 projecting into a screw threaded recess 23 so that upon a turning of the core 21 by means of a knurled head 24 which may be associated therewith, that the core will be moved longitudinally of the spindle 1, and by virtue of its tapered construction will cause a projection or retraction of the blades 8, the upper end of the blades being held in position by means of a nut 27 mounted upon screw threads 26 forming a part of the core 21, which nut 27, similar to the nut 6, is formed with a recess 25 co-acting with the beveled ends 10 of the blades 8.

It is to be noted that in the last described construction, as well as aforestated in the reamer illustrated in Figs. 1, 2, 3 and 4 that the slots 2 extend to one side of the axis of rotation of the spindle 1. By this construction the cutting edges of the blades are brought into radial alinement one with the other, insuring a more efficient operation, and it will also be understood that by virtue of the rotational movement between the member 11 and blades 8 that an even distribution of wear on the parts of these members will be effected, the marker on the col lar 17 permitting at all times of an accurate micrometer reading and adjustment, and the nut 20 serving as a locking member for the parts of such adjustment, and it will also be understood that the fineness of reading permitted by this micrometer adjustment may readily be varied by the pitch of the threads 12.

It is to be understood that numerous changes in construction might readily be resorted to without in the least departing from the scope of our claims, which read:

We claim:

1. An expansion reamer including a spindle, blades mounted upon said spindle and radially movable with respect thereto, screw threads formed upon such spindle, a graduated member mounted upon such screw threads and being adapted to-bear against said blades, and to cause a movement on the part ofthe same, a collar mounted upon such spindle and adjacent to such graduated member, said collar having associated with it indicating means adapted to register with the markings upon said member, said collar being formed with an inwardly projecting tongue adapted to extend into a longitudinal groove formed transversely through such screw threads, whereby to permit only a longitudinal movement on the part of such collar, and means for holding such collar at all times during the operation of such reamer, against said graduated member.

2. An expansion reamer including a spindle, blades radially movable mounted thereon, screw threads formed upon such spindle, a graduated member mounted upon such screw threads being adapted to bear against such blades, and being capable of moving the same, a collar mounted upon such spindle, and adjacent the said graduated member, such collar bearing indicating means adapted to register with the graduations of such member, and being movable longitudinally of such spindle, only, and a lock nut also mounted upon such screw threads and adjacent to said collar whereby to hold the same firml a ainst the graduated member.

S'FAfiLING H. HUMPHREY. FREDERICK H. KORFF. 

